Astronomy Crossword Puzzle

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Across
  1. 2. The mass of a star
  2. 6. When an object in space moves away from us
  3. 11. A baby star
  4. 13. The distance light travels in a year
  5. 15. Astronomers theory for the way the universe began
  6. 16. When massive stars collapse
  7. 17. A galaxy with spiral arms
  8. 19. A galaxy with an oval shape
Down
  1. 1. Sun Star is closest to us
  2. 3. When a star runs out of hydrogen
  3. 4. Sphere that orbits a star
  4. 5. composed of hydrogen and helium
  5. 7. A cloud of dust where stars are formed
  6. 8. Near the end of the main sequence, a large and bright star
  7. 9. A galaxy with an irregular shape (not specific)
  8. 10. An old dying star
  9. 12. When an object in space moves towards us
  10. 14. Where stars spend 90% of their lives
  11. 18. A cluster of stars